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Trina Solar TSM-NEG21C.20-735
Trina Solar Brand review

TSM-NEG21C.20-735

735 Wp TOPCon Bifacial 80%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 233 of 14,005
Compare panels Datasheet PDF
Power (Wp)
735
Strong · top 6%
Efficiency (%)
23.70
Strong · top 5%
Density (Wp/m²)
236.6
Strong · top 6%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
38.3
Typical · median 38.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

Trina Solar's Vertex N TSM-NEG21C.20 71 (715-740W) is designed for maximum energy yield in large-scale projects where every cost element counts and reliability matters. The use of n-type cells in i-TOPCon technology helps reduce typical power losses over time and stabilizes module performance in real-world conditions, even at higher temperatures. The bifacial glass-glass construction enables additional rear-side generation, particularly effective on farms with light backgrounds or in light-reflective systems - without the need to add more rowsof panels.

A key feature of this series is the low-voltage design, which facilitates longer strings and truly reduces BOS costs, leading to a lower LCOE in large plants. The multi-busbar technology improves light capture and supports uniform current transport, while the focus on high environmental resistance aids applications exposed to dust, humidity, or industrial atmospheres. This is an excellent choice for PV farms and large commercial rooftops, where yield, durability, and predictable performance are top priorities.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.70% 23.00% Strong · top 5% 517
Power density 236.6 230.2 Strong · top 6% 582
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 52.1 52.9 Typical 5,576
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 0 caution
Best for

Utility-scale, commercial and hot-climate.

Strengths
23.70% module efficiency

Top 5% of the TOPCon 700-750 W segment, against a median of 23.00%. Ranked 517th in the whole database.

236.6 watts per square metre

Top 6% of the TOPCon 700-750 W segment, against a median of 230.2. Ranked 582nd in the whole database.

Notes from the database
  • Efficiency of 23.7% is 0.7pp above the TOPCon 700-750W median (23.0%)
  • At 236.6 W/m² power density, this panel generates 6.4 W/m² more per unit area than TOPCon 700-750W median (230.2 W/m²)
  • At -0.29%/°C, hot weather performance is typical for TOPCon 700-750W panels
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
  • In the top 4% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 735 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.70 % Strong Segment median 23.00%
Vmpp · Impp 41.90 V · 17.55 A Operating point at max power
Voc · Isc 50.10 V · 18.62 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 38.3 kg Typical Typical · median 38.0 kg
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 642 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Trina Solar TSM-NEG21C.20-735 735 W 23.70% -0.290 38.3 kg You are here
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg -35 W, lighter, +1.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg -40 W, lighter, +1.2 pp
AIKO-A690-MAE78Dw 690 W 24.70% -0.260 34.5 kg -45 W, lighter, +1.0 pp
AIKO-A685-MAE78Dw 685 W 24.50% -0.260 34.5 kg -50 W, lighter, +0.8 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +25 W, cooler, +0.8 pp
AIKO-A785-GRH78Dw 785 W 24.40% -0.260 39.8 kg +50 W, cooler, +0.7 pp
GK-4-78HGBD-780M 780 W 24.30% -0.260 38.7 kg +45 W, cooler, +0.6 pp
AIKO-A780-GRH78Dw 780 W 24.30% -0.260 39.8 kg +45 W, cooler, +0.6 pp
JT755SLk(B) 755 W 24.30% -0.240 36.4 kg +20 W, cooler, +0.6 pp
TSM-NEG21C.20Q-755 755 W 24.30% -0.260 38.3 kg +20 W, cooler, +0.6 pp
TSM-DEG21C.20-645 645 W 20.80% -0.340 38.3 kg -90 W, hotter, -2.9 pp
TSM-DEG21C.20-650 650 W 20.90% -0.340 38.3 kg -85 W, hotter, -2.8 pp
TSM-DE21-655W 655 W 21.10% -0.340 32.3 kg -80 W, lighter, -2.6 pp
TSM-DE21-660W 660 W 21.20% -0.340 32.3 kg -75 W, lighter, -2.5 pp
TSM-DE21-665W 665 W 21.40% -0.340 32.3 kg -70 W, lighter, -2.3 pp
TSM-DE21-670W 670 W 21.50% -0.340 32.3 kg -65 W, lighter, -2.2 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +70 W, cooler, +1.4 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
How does i-TOPCon cell technology in Trina Vertex N panels differ from standard p-type PERC cells?
N-type cells used in i-TOPCon are less susceptible to light-induced degradation (LID) and offer better temperature stability than conventional p-type PERC cells. The Vertex N series has a temperature coefficient of about -0.29%/°C, meaning smaller power losses at high operating temperatures. In practice, the panel maintains higher efficiency for longer, especially in large ground-mount installations exposed to heat buildup.
How much extra energy does the bifacial glass-glass design in the Vertex N actually generate?
Rear-side energy gain depends on ground albedo, mounting height, and tilt angle - on light-colored gravel or roofing membrane, annual output can increase by several to over ten percent. The glass-glass construction also improves mechanical durability and reduces degradation, resulting in more stable long-term yield, particularly in PV farms with reflective surroundings.
What warranty comes with Trina Solar Vertex N TSM-NEG21C.20 panels?
The manufacturer offers a 12-year product warranty and a 30-year linear power output warranty, which is standard for premium modules used in utility-scale installations. This power warranty guarantees a predictable, gradual output decline over time, making it easier to model accurate ROI when planning PV farms or large commercial installations.
Does the Vertex N's low-voltage design actually reduce costs on large-scale installations?
Yes, lower operating voltage combined with high per-module power allows longer strings to be built without exceeding inverter voltage limits. This reduces the number of strings needed, DC cabling, and other BOS components, which lowers cost per kWp on large projects - the manufacturer reports LCOE savings of a few percent compared to conventional module designs.
Are the 715-740W Vertex N panels suitable for large commercial roofs, or only ground-mount farms?
The series works well in both applications, though due to the large module size and weight of the higher-power variants, it performs best on large commercial and industrial roofs with adequate load capacity, as well as on PV farms. High environmental resistance, including against dust and moisture, supports operation in harsher conditions typical of warehouse or industrial rooftops.
What does multi-busbar technology add compared to panels with fewer busbars?
A higher number of thin busbars shortens the current path within each cell, reducing resistive losses and improving light capture by minimizing cell shading. This results in higher module efficiency and better resistance to microcracks, which matters for transport and installation of these large-format, high-power panels.
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